This can be achieved in a similar method to another one of our KB articles - https://help.octopus.com/t/how-can-i-require-an-approval-when-a-major-or-minor-version-is-deployed-to-an-environment-the-first-time.
In it, it discusses having an approval when a major or minor version is deployed for the first time. That solution uses:
Octopus supports conditional syntax operators such as == and !=.
It doesn’t, however, support:
- less than
< - greater than
>
Therefore we can’t add a run condition using that kind of syntax.
Instead, we can simply add a script step and a manual intervention step at the start of our deployment process which looks like this:
The Calculate Newer Release script step contains the following source:
$ReleaseNumberBeingDeployed = $OctopusParameters['Octopus.Release.Number']
$ReleaseNumberAlreadyDeployedInEnvironment = $OctopusParameters['Octopus.Release.CurrentForEnvironment.Number']
$idx = $ReleaseNumberBeingDeployed.IndexOf("-")
if($idx -ge 0)
{
$ReleaseNumberBeingDeployed = $ReleaseNumberBeingDeployed.Substring(0, $idx)
}
$currentReleaseVersion = New-Object System.Version($ReleaseNumberBeingDeployed)
$idx = $ReleaseNumberAlreadyDeployedInEnvironment.IndexOf("-")
if($idx -ge 0)
{
$ReleaseNumberAlreadyDeployedInEnvironment = $ReleaseNumberAlreadyDeployedInEnvironment.Substring(0, $idx)
}
$envReleaseVersion = New-Object System.Version($ReleaseNumberAlreadyDeployedInEnvironment)
$newerRelease = $false
if($currentReleaseVersion -lt $envReleaseVersion)
{
$newerRelease = $true
}
Set-OctopusVariable -name "Result" -value $newerRelease
The script step above is written in PowerShell but can be converted to a language of your choice. It simply compares two versions with one another:
Octopus.Release.Number- this is the version of the project release version being deployedOctopus.Release.CurrentForEnvironment.Number- this is the project release version of the project that is already deployed to the Environment.
By comparing these two Octopus system variables, we can make a decision as to whether the version about to be deployed is lower than the version currently deployed to that same environment
We then set the result of this comparison in an Output variable called Result.
Next, in our new Version number Check step which runs directly after the Script step above, we can add a run condition which checks the Output variable from the previous step:
.
Tip: You could simplify the run condition variable:
#{if Octopus.Action[Calculate Newer Release].Output.Result}true#{/if}
into a Project Variable if you wanted.
After this has been added, we can see this in action:
You can see from the above screenshot, Development has v0.0.14 deployed to it from the Default channel.
If we then go ahead and deploy v0.0.13 from the Alpha channel to Development, the Manual intervention step will run to ask for confirmation that this is expected:
